...Heavy rainfall and flash flash flooding potential to shift east fromthe Southern Plains today, to the Central Plains and central Gulf Coast onChristmas Eve, then into the Southeast on Christmas Day......Confidence is growing in an impactful winter storm across parts of theCentral Plains and Upper Midwest for both Christmas Eve and Christmas Day,resulting in a White Christmas and treacherous travel for some......Unusually mild temperatures along and east of the Mississippi Riverwith some record breaking warmth possible in the Midwest and Great Lakesboth Christmas Eve and Christmas Day...